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Automatic manipulation and patterning of biological cells into an artificial scaffold is an imperative step in the production of high-quality tissue for tissue transplantation. This paper examines the incorporation of dielectrophoresis into a three-dimensional (3D) scaffold body for batch manipulation and patterning of cells. To facilitate dielectrophoresis-based manipulation, a multi-layer biocompatible...
This paper focuses on circuit simulation for thin film transistors that can be based on organic or inorganic metal-oxide materials and fabricated using solution processing such as printing or using the more conventional methods such as sputtering. In particular, the paper focuses on solution processed metal oxides. Existing compact device models are generalized in the article to include AC properties...
High sensitive sensors are one of the goals of the modern society due to an increasing necessity for real-time monitoring. To achieve this, new devices and materials are being developed nowadays. In particular, electroacoustic resonators have gained importance in the chemical and biological sensors field owing to their promising performances. Although important advances have been made in the electroacoustic...
Time and again geosynchronous communication satellites worldwide are plagued by unexpected power failures due to sustained arcing in power systems, the phenomenon which is under vigorous investigation. Though many studies have been conducted on arc phenomenon across polarized electrodes, very little attention is paid on the propagation of an initialized arc into adjacent power carrying conductors...
The aim of this ethnographic study is to understand welding practices in shipyard environments with the purpose of designing an interactive robot welder. The robot is meant to help workers with their daily job while being deployed on a jack-up rig. The design of the robot, including its user interface turns out to be a challenging task due to several problematic conditions encountered on the shipyard:...
Over the last decade we developed methods for the fabrication of laser-structured electrode arrays for neural engineering. For these electrode arrays a metal foil was structured with a 1064 nm Nd:YAG laser in the nanosecond pulse regime and placed within a silicone rubber substrate. Due to process restrictions the individual electrode sites are not in plane with the upper layer of the silicone rubber...
A multi-layer piezoelectric actuator (PEA) stacks piezo thin layers which can convert electric energy to deformation. It is widely used to generate nano-scale displacements. It is well known that the more layers one can stack for a given overall PEA length, the more deformation it can produce when excited by the same voltage. As a result, there is a tendency to reduce the thickness of piezo layers...
We investigated the morphological and electrochemical properties of an explanted laser-machined 32 channel electrocorticogram (ECoG) electrode array made of platinum-iridium and silicone rubber. It was connected to a wireless brain-computer interface (BCI) and implanted in a sheep for more than 15 months. Recordings and stimulations of cortical activity were conducted over the whole period on a regularly...
Energy storage devices have become more indispensable in our lives. Among various energy storage devices, supercapacitors have been considered as one of the most promising candidates. In terms of the components of supercapacitor, current collector plays a significant role in enhancing the performance of the supercapacitors. Here we report a novel current collector preparation method through depositing...
Graphene oxide was synthesized by an improved method, and then MnO2/graphene oxide composite was obtained using chemical precipitation. The MnO2/graphene nanocomposite was obtained via hydrazine reduction of the MnO2/graphene oxide composite. The morphology and surface chemical composition of the composites have been investigated by scanning electron microscope (SEM), Fourier transform infrared spectrum...
Being direct band-gap materials, carbon nanotubes (CNTs) have a potential to be efficient optoelectronic detection material. In order to explore this potential application, a CNTs-based device is fabricated with micromachined techniques and depositing the CNTs on the substrate surface with CVD growth methods. The structure of the CNTs-based device is characterized with SEM picture. Normally CNTs forms...
Supercellulose gel and single-wall carbon nanotubes (SWCNTs) were used for the creation of binder-free electrode for supercapacitor application and the properties of the electrode were investigated in aqueous electrolyte. Two layers of the formed composite material were inserted on graphite current collectors and separated from each other by a separator to create a supercapacitor prototype for measurements...
A multi-physics model is developed based on P2D model, including the electrochemical part, thermal part and the temperature distribution. It can simulate the physical and chemical phenomena from the scale of the active particles to the scale of whole battery. The charging optimization is also investigated, two internal characteristics, which can only be calculated by the proposed model, are treated...
Nonvolatile memories have emerged in recent years and have become a leading candidate towards replacing dynamic and static random-access memory devices. In this article, the performance of physical TiO2 and TaO2 nonvolatile memristive devices were compared in terms of switching speed, retention and endurance. TaO2 memristive devices have shown better endurance (108 times more switching cycles) and...
Electrical discharge machining is basically a nonconventional material removal process which is widely used to produce dies, punches and moulds, finishing parts for aerospace and automotive industry. Inconel X-750, a high strength, age-hardenable, Ni-base super alloy, finds wide range of applications in aerospace engineering on the basis of its excellent high-temperature and cryogenic properties....
Accelerated aging methods are likely being adopted within the research laboratory in an effort to build on the collaborative efforts between industry and academia. These “quick test” methods are useful inasmuch one does not have several months to evaluate whether or not an electrode material will fail similarly as compared with another. A question more difficult to answer by these particular methods...
Alumina nanoparticles have been increasingly used in the areas of medicine, biochemistry and industry. A number of chemical methods have been used for the preparation of alumina nanoparticles, including the introduction of surfactants to improve the suspensivity of the nano-sized particles. In this study, alumina (Al2O3) nanoparticles have been fabricated by using Electrical Discharge Machining (EDM)...
Lifetime of most vacuum and gas-discharge switching devices is determined primarily by electroerosion resistance of electrodes manufactured from refractory materials — molybdenum, tungsten, etc. Low thermal conductivity and electrical conductivity of these materials contribute to an undesirable increase of temperature of the electrodes surface. In this paper the calculation results of characteristics...
The Pulsed Electroacoustic method has been widely used in research labs and industries for space charge measurement for quite some time. Due to its robustness and simplicity it has attracted great attention of researchers. Various models of PEA system have been reported using numerical simulation and COMSOL to address issues related to charge signal. Recently, the authors have reported a PSpice model...
The move to PWM-based waveforms with substantial high frequency content results in much greater capacitive currents in the stress grading (SG) material and the conductive armor tape (CAT) which increase power dissipation and electric fields within these elements. Treating this subject numerically is challenging for several reasons, viz., (i) the need to measure SG nonlinear properties as a function...
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